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Wut year again is it? many asian application of the Pajero/Shogun had a DOCH head . Also since this engine has distributorless ignition system as yurs should have , like i say , the Camshaft/TDC sensor at the back of the cylinder head plays a big role in this. Ive asked before i remember if that sensor came already with the engine of if yu had to install yur old one on the newer engine. If so was the timing disturbed. If it is a DOCH head 3.5 it makes a big deal as to , the DOCH heads are the same as GTO's with MIVEC so the cam timing and phasing is very agressive. Also if the timing belt was changed prior to yu getting the engine or after yu got it, if the camshafts are a few degrees off /apart or with the spark too much at TDC this will also cause the noise.
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